Calculate 71764

The angle at the base of an isosceles triangle is 18 ° larger than the angle at the central vertex. Calculate the size of the interior angles.

Correct answer:

A =  66 °
B =  66 °
C =  48 °

Step-by-step explanation:

A=B A=18+C A+B+C=180  AB=0 AC=18 A+B+C=180  Row2Row1Row2 AB=0 BC=18 A+B+C=180  Row3Row1Row3 AB=0 BC=18 2B+C=180  Pivot:Row2Row3 AB=0 2B+C=180 BC=18  Row321 Row2Row3 AB=0 2B+C=180 1.5C=72  C=1.572=48 B=2180C=218048=66 A=0+B=0+66=66  A=66 B=66 C=48



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Calculation of an isosceles triangle.
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