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Work out the length of AG in the cuboid below.

Give your answer to 2 d.p.
E
A
F
-76°
B
31 cm
H
G
22 cm
D
Not drawn accurately

Work out the length of AG in the cuboid below. Give your answer to 2 d.p. E A F -76° B-example-1

1 Answer

2 votes

Assuming the given angle of 76° is accurate, the length of AG is approximately 30.35 cm (to 2 decimal places).

If the actual angle is unknown, AG can be expressed as BG * sin(∠ABG).

1. Identify relevant triangles:

Triangle ABG is a right triangle where we need to find the length of the hypotenuse AG.

We are given the lengths of two sides: AB = 22 cm (from the diagram) and BG = 31 cm (from the diagram).

2. Use trigonometry:

We can use the sine function (sin) to relate the sides of the right triangle: sin(∠ABG) = AG / BG.

We are given the angle ∠ABG = 76° from the diagram.

However, we need to be cautious because the diagram states "Not drawn accurately." This means the angle might not be exactly 76°.

3. Two possible approaches:

a) Use the given angle (assuming it's accurate):

sin(76°) ≈ 0.978

Rearranging the equation, AG = BG * sin(∠ABG) ≈ 31 cm * 0.978 ≈ 30.35 cm

b) Treat the angle as unknown:

We cannot directly solve for AG without knowing the accurate value of ∠ABG.

However, we can express AG in terms of BG and sin(∠ABG): AG = BG * sin(∠ABG).

This way, if the actual angle is provided later, you can simply plug it into the equation to find AG.

User Washington Guedes
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