IB Maths AI HL AI 3.1 Trigonometry and 3D geometry questions

Exam-style questions in the shape of Paper 1 and Paper 2, with full markschemes. Read the markscheme, or type, photograph or draw your answer and get it marked.

Question 1

Paper 2Easy7 marks

A survey team is preparing a map of a coastal reserve. In one triangulation, stations AA and BB are 138 m138\text{ m} apart. The measured angles in triangle ABPABP are ∠BAP=52∘\angle BAP=52^\circ and ∠ABP=67∘\angle ABP=67^\circ

A second mapped zone is represented by triangle XYZXYZ where XY=84 mXY=84\text{ m} XZ=117 mXZ=117\text{ m} and ∠YXZ=42∘\angle YXZ=42^\circ

(a)

Determine ∠APB\angle APB

[2]
(b)

Show that AP=145 mAP=145\text{ m} correct to three significant figures.

[3]
(c)

Determine the area of triangle XYZXYZ correct to three significant figures.

[2]

Question 2

Paper 2Easy4 marks

An architect models a rectangular atrium as a cuboid measuring 8 m8\text{ m} by 6 m6\text{ m} on the floor and 9 m9\text{ m} high. Let A=(0,0,0)A=(0,0,0) be one lower corner and G=(8,6,9)G=(8,6,9) the opposite upper corner, with coordinates in metres and the floor in the plane z=0z=0

(a)

Find the coordinates of the midpoint of AGAG

[2]
(b)

Find the angle between AGAG and the floor, to the nearest degree.

[2]

Question 3

Paper 1Medium6 marks

A mapping team approximates a wetland by triangle ABCABC The horizontal distance between survey stations AA and BB is 1.80 km1.80\text{ km} The measured interior angles are ∠BAC=52.6∘\angle BAC=52.6^\circ and ∠ABC=68.3∘\angle ABC=68.3^\circ

The wetland qualifies for a reserve if its mapped area is at least 1.20 km21.20\text{ km}^2

(a)

Find ∠ACB\angle ACB

[1]
(b)

Show that AC=1.95 kmAC=1.95\text{ km} correct to three significant figures.

[2]
(c)

Hence, using your answer to part (b), calculate the area of triangle ABCABC correct to three significant figures, and state whether the wetland qualifies for a reserve.

[3]

Question 4

Paper 1Medium6 marks

A surveyor uses triangulation to estimate the area of a triangular wetland ABCABC Points AA and BB lie on an accessible straight bank, and AB=dAB=d metres. The measured interior angles are ∠BAC=48∘\angle BAC=48^\circ and ∠ABC=67∘\angle ABC=67^\circ

(a)

Find ∠ACB\angle ACB

[1]
(b)

Show that the area TT in m2\text{m}^2 is approximately given by T=0.377d2T=0.377d^2

[2]
(c)

The surveyor wants to map a region with an area of at least 6000 m26000\text{ m}^2 Determine the required value of dd to 3 significant figures. Hence state whether a baseline of 125 m125\text{ m} is sufficient.

[3]

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