Question

ABC is isoscele with AB=AC .lf A =70 what is the measure of B ?​

Answer 1

Given : △ ABC is isosceles with AB=AC ,E and F are the mid-points of BC, CA and AB

To prove: AD⊥EFand is bisected by t

construction: Join D, F and F

Proof: DE∣∣AC and DE=

2

1

AB

and DF∣∣Ac andDE=

2

1

AC

The line segment joining midpoints of two sides of a triangle is parallel to the third side and is half of it

DE = DF (∵AB=AC) Also AF=AE

∴AF=

2

1

AB,AE=

2

1

AC

∴DE=AE=AF=DF

and also DF∣∣ AE and DE∣∣AF

⇒ DEAF is a rhombus.

since diagrams of a rhombus bisect each other of right angles

∴AD⊥EF and is bisected by it

solution

Answer 2

Answer:

B = 40

Step-by-step explanation:

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