What is the surface area of this? ignore my

2400cm^2

Step-by-step explanation:

50 * 10 = 500

(40 * 30 / 2) * 2 = 1200

30 * 10 = 300

40 * 10 = 400

Now add them all together.

500 + 1200 + 300 + 400 = 2400

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value