Question

If angle a is 60° and angle c is 30°what is the measurement of angle b ?​

Answer 1

90 degrees; one triangle adds up to 180 so you take 30+60 which is 90 and subtract 180-90 and you get 90 degrees

Answer 2

m∠B = 90°

Explanation:

Note that the figure given to you is a triangle, which has 3 angles, and the total measurement of 3 angles is = 180°.

Let m∠B = x

m∠A = 60°

m∠C = 30°

Set the equation:

m∠A + m∠B + m∠C = 180°

Plug in the corresponding numbers to the corresponding variables:

60 + x + 30 = 180

Isolate the variable, x. Combine like terms:

x + (60 + 30) = 180

x + (90) = 180

Isolate the variable, x. Subtract 90 from both sides:

x + 90 (-90) = 180 (-90)

x = 180 - 90

x = 90

m∠B = 90°