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3d Pythagoras and Trigonometry

discia.org 10 questions · 45 marks
Name Date
  1. Calculator 6 marks

    The diagram shows a cuboid \(ABCDEFGH\).

    7 cm14 cm22 cmABCDEFGH

    \(AB = 7\) cm, \(AD = 14\) cm and \(BF = 22\) cm.

    (a)

    Find the length of \(AC\).

    Give your answer to 1 decimal place.

    (b)

    Find the length of \(AG\).

    Show answer
    (a) \(15.7\ \text{cm}\)
    (b) \(27\ \text{cm}\)
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  2. Calculator 5 marks

    A box is in the shape of a cuboid measuring \(25\) cm by \(13\) cm by \(18\) cm.

    25 cm13 cm18 cm
    (a)

    Find the length of the longest straight rod that will fit inside the box.

    Give your answer correct to 1 decimal place.

    (b)

    A straight knitting needle is \(37\) cm long.

    Will the knitting needle fit inside the box? Write Yes or No.

    Show answer
    (a) \(33.4\ \text{cm}\)
    (b) No
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  3. Either paper 3 marks

    Here is a cuboid.

    6 cm14 cmh cmDiagram NOT accurately drawn

    Its base is a rectangle measuring \(6\) cm by \(14\) cm, and its height is \(h\) cm.

    The distance from one corner of the cuboid to the opposite corner is \(31\) cm.

    Work out the value of \(h\).

    Show answer
    \(27\ \text{cm}\)
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  4. Either paper 4 marks

    Relative to an origin \(O\), the point \(A\) has coordinates \((10,\ 21,\ 22)\) and the point \(B\) has coordinates \((13,\ 17,\ 10)\).

    Calculate the length of \(AB\).

    Show answer
    \(13\ \text{units}\)
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  5. Calculator 4 marks

    The diagram shows a cuboid \(ABCDEFGH\).

    14 cm6 cm15 cmABCDEFGH

    \(AB = 14\) cm, \(AD = 6\) cm and \(BF = 15\) cm.

    Work out the size of the angle between \(AG\) and the base \(ABCD\).

    Give your answer to 1 decimal place.

    Show answer
    \(44.6^\circ\)
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  6. Calculator 7 marks

    The diagram shows a solid pyramid \(ABCDV\).

    10 cmx cmABCDV

    The base \(ABCD\) is a square of side \(10\) cm. The vertex \(V\) is vertically above the centre of the base, and the perpendicular height of the pyramid is \(16\) cm.

    All four sloping edges are the same length. One of them is marked \(x\).

    (a)

    Find the value of \(x\).

    Give your answer correct to 1 decimal place.

    (b)

    Find the size of the angle between the edge marked \(x\) and the base \(ABCD\).

    Give your answer correct to the nearest degree.

    Show answer
    (a) \(17.5\ \text{cm}\)
    (b) \(66^\circ\)
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  7. Calculator 4 marks

    The diagram shows a solid pyramid \(ABCDV\).

    20 cm44 cmABCDV

    The base \(ABCD\) is a square of side \(20\) cm, and \(V\) is vertically above the centre of the base.

    All four sloping edges are the same length, \(44\) cm.

    Work out the perpendicular height of the pyramid.

    Give your answer correct to 1 decimal place.

    Show answer
    \(41.7\ \text{cm}\)
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  8. Calculator 3 marks

    A solid pyramid \(ABCDV\) has a square base \(ABCD\) of side \(24\) cm.

    \(V\) is vertically above the centre of the base, and the perpendicular height of the pyramid is \(46\) cm.

    \(M\) is the midpoint of \(AB\).

    Find the size of the angle between the face \(VAB\) and the base \(ABCD\).

    Give your answer correct to 1 decimal place.

    Show answer
    \(75.4^\circ\)
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  9. Calculator 5 marks

    The diagram shows a solid triangular prism.

    14 cm26 cmACF

    Each end of the prism is an isosceles triangle with a base of \(14\) cm and a perpendicular height of \(15\) cm. The prism is \(26\) cm long.

    Three corners are marked. \(A\) is a bottom corner of one end, \(C\) is the top corner of that same end, and \(F\) is the top corner of the other end.

    Find the length of \(AF\).

    Give your answer to 1 decimal place.

    Show answer
    \(30.8\ \text{cm}\)
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  10. Calculator 4 marks

    On a moor, a vertical radio mast \(PQ\) stands on level ground. \(P\) is at the bottom and \(Q\) is at the top.

    Two straight ropes run from \(Q\) to two anchors, \(A\) and \(B\), on the ground. \(A\), \(P\) and \(B\) do not lie in a straight line, so the two ropes are in different vertical planes.

    \(QA = 25\) m and \(QB = 27\) m.

    Rope \(QA\) makes an angle of \(36^\circ\) with the ground.

    Work out the size of the angle rope \(QB\) makes with the ground.

    Give your answer correct to the nearest degree.

    Show answer
    \(33^\circ\)
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discia.org 3d Pythagoras and Trigonometry · sheet 1
Answers 3d Pythagoras and Trigonometry · sheet 1
  1. (a) \(15.7\ \text{cm}\)
    (b) \(27\ \text{cm}\)
  2. (a) \(33.4\ \text{cm}\)
    (b) No
  3. \(27\ \text{cm}\)
  4. \(13\ \text{units}\)
  5. \(44.6^\circ\)
  6. (a) \(17.5\ \text{cm}\)
    (b) \(66^\circ\)
  7. \(41.7\ \text{cm}\)
  8. \(75.4^\circ\)
  9. \(30.8\ \text{cm}\)
  10. \(33^\circ\)
discia.org 3d Pythagoras and Trigonometry · sheet 1