Question

A piece of fabric is in the shape of a triangle as shown below. Find the missing angle measure.

Answer 1

According to the Angles Sum Property of triangle, the sum of all three interior angles of the triangle is 360 degrees.

Given that the two angles are 73 degree and 58 degree. Let this third angle be 'x'.

Then it follows that,

`\begin{gathered} 73+58+x=180 \\ 131+x=180 \\ x=180-131 \\ x=49 \end{gathered}`

Thus the value of the unknown angle is 49 degrees.