Question

#9. Find the area of the triangle. Thanks!

Answer 1

C.
`63.4cm^2`

Explanation:

I love trigonometry

the area of a triangle is equal to
`(1)/(2)*a*b*sinC`

we have a b and Angle C so just put that in the formula :)

`(1)/(2)*9*15*sin70\\`

`63.4cm^2`

Answer 2

C

Explanation:

The area (A) of the triangle is calculated using

A =
`(1)/(2)` ab sinC

where a, b are the 2 sides and C is the angle between them

here a = 9, b = 15 and C = 70°, hence

A = 0.5 × 9 × 15 × sin70° = 63.4 cm² → C