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4 votes
What is the value of x

What is the value of x-example-1

2 Answers

7 votes

Answer:

x = 21

Explanation:

Sum of interior angles in a triangle = 180

3x + x - 4 + 100 = 180

4x + 96 = 180

4x = 84

x = 21

User Adrien Parrochia
by
8.5k points
2 votes

The three inside angles of a triangle need to equal 180 degrees.

One angle is given as 100, so the other two need to equal 180-100 = 80 degrees.

So now you have:

x-4 + 3x = 80

Combine like terms"

4x - 4 = 80

Add 4 to each side:

4x = 84

Divide both sides by 4:

x = 84/4

x = 21

User Andi North
by
7.4k points

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