Question

One of the base angles of an isosceles triangle is 70°. Find its vertical angle ​

Answer 1

Answer:

Given : One of the base angle of an isosceles triangle is 70°

⇒ Other base angle of the isosceles triangle = 70°

Now, we know that the sum of the measure of all the angles of a triangle is 180°

⇒ One base angle + other base angle + vertical angle = 180°

⇒ 70° + 70° + vertical angle = 180°

⇒ 140° + vertical angle = 180°

⇒ vertical angle = 180° - 140° = 40°

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Answer 2

First method

Answer:

55°

Step-by-step explanation:

As Isosceles triangle have 2 angles equal.

Let it be x.

Then x + x + 70 = 180.

x = 55°.

second method

Answer :

70+70+x=180

140+x=180

x=180-140

x=40

Hey friend the answer is : 40 degree

hope it helps you

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