Question

find the lettered angle in each of the following.​

Answer 1

Answer:

140 degrees

Step-by-step explanation:

From the given picture, we can identify that the given triangle is an isosceles triangle, in which two sides are equal while the third angle is different. We know that the sum of angles of triangle is equal to 180 degrees. So,

20 + a + b = 180

20 + 20 + b = 180 (because two of the adjacent sides are equal)

40 + b = 180

b = 180 - 40

b = 140

Hence, the given angle to be found is 140 degrees.