Question

EXERCISE 13 (A)
The measure of one angle of a parallelogram is 80° What are the measures o
the remaining angles ?
adiacent angles of​

Answer 1

Answer:

In a parallelogram,

1) Opposite angles are equal. ---------- (1)

therefore,

angle A=angle C

Now,

2) Adjacent angles of a llgrm. are supplementary.

therefore.

angle C + angle D =180°

80°+ angle D =180°

angle D=100°

from(1)

angle B =angle D =100°

I hope it helps u.

Answer 2

measure of one angle of a

parallelogram is 80°.

opposite angles of a parallelogram are congruent

therefore, angle A=angle C

80°=angle C

angle C= 80

measure of adjacent angles of a parallelogram is 180°

therefore, angle A +angle B = 180°

80° + angle B = 180°

angle B = 180° - 80°

= 100°

angle B = angle D (opposite angles....)

100°=angle D

angle A = 80°

angle B = 100°

angle C = 80°

angle D = 100°