angle T / C is an Isosceles triangle with a vertex angle /. If the measure of angle I = 905 then find the measure of angle r
(1 point)
A.15
B.45
C.90°
D.30
Since angle T / C is an isosceles triangle with vertex angle /, we know that the base angles are congruent. Therefore, angle T = angle C = /.
Given that the measure of angle I = 90°, we can conclude that angle I is the sum of angles T and C.
/ + / = 90°.
To find the measure of angle r, we need to subtract the measure of angle I from 180° (since we are dealing with a triangle).
180° - 90° = 90°.
Therefore, the measure of angle r is 90°.
Answer: C. 90°