Question

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Answer 1

Step-by-step explanation:

b. I in ∆ABD and ∆ACD

AB =AC

BD=DC

angle BDA =angle CDA

ii. in ∆ABD and ∆ACD

AB =AC ( given)

BD=DC ( D bisects BC in two equal parts)

angle BDA =angle CDA (90•)

by SAS congruence rule

C. area of rectangle= l× b

391 = 23×b

b= 391÷23

b=17