Question

How do we do this? plzzz helppp​

Answer 1

Answer:

AB = 5.6 cm

Step-by-step explanation:

To find the length of side AB, which is one of the sides of right angled triangle ABC given above, we would apply the trigonometric ratio formula.

The given angle (θ) = 62°

Length of hypotenuse = BC = 12 cm

Length of adjacent side = AB = ?

We would use the following trigonometric ratio formula:

Cos(θ) = adjacent/hypotenuse

$cos(62) = \frac{AB}{12}$

Multiply both sides by 12 to make AB the subject of formula

$cos(62)*12 = \frac{AB}{12}*12$

$cos(62)*12 = AB$

$0.4695*12 = AB$

$0.4695*12 = AB$

$5.634 = AB$

Length of side AB = 5.6 cm (approximated to 1 decimal place)