Question

( operatorname{lom} A B C )
[
begin{array}{c}
A B C D rightarrow A B=C D A
A D=B C
A B=3 x Rightarrow B C=5 x
end{array}
]
( Rightarrow quad ) Permeten ( =A B+B C+C D+A D )
Fh
[
begin{aligned}
80 &=3 x+5 x+A B+B C
&=8 x+3 x+5 x
80 &=16 x
x &=frac{20}{4}=50
&=5 mathrm{cm}
end{aligned}
]
80 , sides of parallelogram ( =A B ) f ( B C ) ( =3(5)+5(5) )
( =15 mathrm{cm} & 25 mathrm{cm} )

# 9. The sides of a quadrilateral are produced in order. What is the sum of the four exterior angles 10. The measure of the angles of a pentagon are (x - 5). (x - 6)". (2x - 7)º, x° and (2x - 2). Find the value of X. 11. The ratio of two sides of a parallelogram is 3:5 and its perimeter is 80 cm. Find the sides of the parallelogram. O VS Good

Solution