In the triangle, suppose that m

12

Step-by-step explanation:

angle E is 90º so the other two angles must sum to 90º

4x-15+3x+21=90

7x+6=90

7x=84

x=12º

m∠C=4(12)-15=48-15=33º

m∠D=3(12)+21=36+21=57º

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

-4

step-by-step explanation:

do 6-10=

if u need it to be negative.