# Triangle TIC is an isosceles triangle with a vertex angle I. If the measure of Angle I = 90degrees, then find the measure of angle T.

15degrees, 45degrees, 90degrees, 30degrees

**Solution:**

Given that TIC is an __isosceles triangle__ with vertex angle I

Angle I = 90

From the property of an isosceles triangle, when the vertex angle is 90, the other two angles apart from the vertex angle are equal.

Hence, angle T = angle C

We know that the sum of __interior angles__ of a triangle is 180

Angle T + angle I + angle C = 180

X + 90 + X = 180

2x + 90 = 180

2x = 180 - 90 = 90

x = 45

Therefore, angle T = 45 degrees

## Triangle TIC is an isosceles triangle with a vertex angle I. If the measure of Angle I = 90degrees, then find the measure of angle T.

**Summary:**

Triangle TIC is an isosceles triangle with a vertex angle I. If the measure of Angle I = 90degrees, then the measure of angle T is 45 degrees.

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