If triangle abc is isosceles, what is the value of ∠a?

a. 78°
b. 68°
c. 58°
d. 102°

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Short A: 78 °

Why?

Well, when we have a triangle, we have to add up all the angles to be able to have 180°. So, we have an isosceles triangle, we know that an isosceles triangle has two equal sides. We have two unknown sides, but we know that side C is also 51°. When we add both of them up, we have 102. Which of the answer choices make it add up to 180? 78.

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3units/ 5 feet = 60 units/ 100 feet3 units/ 5 feet = 18 units/ 30 feetthe dimensions of the scale drawing are 60 units by 18 units.hope this !