Question

pls give me correct ans I will mark you as brainlist​

Answer 1

Step-by-step explanation:

Let the common multiple of the given ratio then

∴∠A=5x

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and∠B=4x

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□ ABCD is a parallelogram.

∴∠A+∠B=180

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[Adjacent angle of parallelogram are supplementary]

∴5x+4x=180

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⇒9x=180

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⇒x=180/9

⇒x=20

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∠B=4x=4×20

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=80

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The measure of ∠B is 80

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Answer 2

Answer:

Using opposite angles test for parallelogram, prove that every rectangle is a

parallelogram.

Given : ABCD is a rectangle

To prove: ABCD is a parallelogram

Proof: ABCD is a rectangle

ZA= ZB=ZC = ZD=90°

InABCD

(given)

A=90°

(1) (Angles of a rectangle)

B=90°

ABCD is a parallelogram. (all side are same of rectangle )