A side of the triangle below has been extended to form an exterior angle of 142°. Find the value of x.

x is 52°

Step-by-step explanation:

Find the diagram attached.

The sum of interior angles is equal to exterior

Interior angles are 90° and x°

Exterior angle = 142°

90+x = 142

x = 142-90

x = 52

Hence the value of x is 52°

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.