How to I find a? It’s round to the nearest tenth.

a ≈ 21.8

Step-by-step explanation:

We require the third angle in the triangle

Subtract the sum of the 2 angles from 180

third angle = 180° - (75 + 31.8)° = 180° - 106.8° = 73.2°

Using the Sine rule, that is

= ( cross- multiply )

a × sin75° = 22 × sin73.2° ( divide both sides by sin75° )

a = ≈ 21.8 ( to the nearest tenth )

the solution is h=10 because you add 9 to each side of the equation.

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)