Question

please help me In finding this answer​

Answer 1

Answer:

(A) AC=AB

THEREFORE AB=20,

GIVEN THAT ABD IS RIGHT ANGLED TRIANGLE

SO,USING PYTHAGORAS THEOREM

AB^2=BD^2+AD^2

(20)^2=BD^2+(10)^2

400-100=BD^2

UNDER ROOT300=BD

(B) GIVEN THAT ANGLE D IS 90 DEGREE

ANGLE B =45 DEGREE

SO, ANGLE A=A+45+90=180

135+A=180

A=180-135

A=45

(C) BC=BD+DC

BC=UNDER ROOT300 +UNDER ROOT300 =(UNDER ROOT300)^2

BC=300

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