Find the side length of the triangle

19

Step-by-step explanation:

The markings on the triangle means that this is an equilateral triangle (All sides are the same length)

So, we can set the two equations we have equal to each other

4x + 7 = 3x + 10

x + 7 = 10

x = 3

Plug it into either equation

3(3) + 10 = 19

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according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: