Question

9 ) In A ABC, P and Q are the midpoints of AB
and AC respectively. If BC + PQ = 21 cm,
then find BC.​

Answer 1

Step-by-step explanation:

एक्टिवा ऑफ बीसी एंड इट इज इज इज द रॉन्ग आंसर ऑफ दिस क्वेश्चन एंड क्वेश्चन इज वेरी डिफिकल्ट वेरी इजी एंड वेरी इजी फॉर अदर

Answer 2

Step-by-step explanation:

Correct option is A)

If R, Q and P are the midpoints of AB, AC and BC, and by applying the theorem:-

The line segment joining the midpoints of two side of a triangle is parallel to the third side and equal to half of it, we get

PQ=21AB=AR and PQ∣∣AR

PQ=21AC=AQ and PR∣∣AQ

Since the above conditions are sufficient for a parallelogram, therefore ARPQ is a parallelogram.

∴ Perimeter of ∥gm=ARPQ=2(AR+AQ)=AB+AC=(30+21)cm=51cm