Answer:
80
multiply all of them. since area is equal to Length time width.
Answer:
3 plus 4. and 2 plus 1. or 4 plus 3 or 1 plus 2
Step-by-step explanation:
A rectangle has 4 sides
each side is a right angle
a right angle by definition is 90 degrees

False
Answer:
Given : s||t
Exterior sides in opposite rays : ∠5 and ∠7 are supplementary
Definition of supplementary angles : m∠5 + m∠7 = 180°
If lines are ||, corresponding angles are equal : m∠1 = m∠5
Substitution : m∠1 + m∠7 = 180°