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4 years ago

10

Please help me! thanks :)

2 answers:

Lilit [14]4 years ago

8 0

M<STR = 180 - 8x degrees
also m < SRT = 180-8x ( because side RS = side ST, so isosceles triangle)
So
7x - 54 + 180 - 8x = 8x (ext. angle of triangle =sum of opposite internal angles)

7x - 8x - 8x = -180 + 54 = -126
-9x = -126
x = 14 answer

inna [77]4 years ago

4 0

The sum of the measures of the angles of a triangle is 180 degrees.

Angles STU and STR are supplementary angles.
Angles R and STR are congruent.

m<STU + m<STR = 180

8x + m<STR = 180

m<STR = 180 - 8x

m<R = m<STR = 180 - 8x

m<RST + m<R + m<STR = 180

7x - 54 + 180 - 8x + 180 - 8x = 180

-9x + 360 = 180

-9x = -126

x = 14

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