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एक समलम्ब की समांतर भुजाएँ 3 सेमी और 4 सेमी है। इनके बीच की दूरी 3 सेमी है। क्षेत्रफल ज्ञात कीजिए।

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b1 = 3 सेमी, b2= 4 सेमी, h = 3 सेमी 

अतः समलम्ब का क्षेत्रफल =1/2 x (समान्तर भुजाओं का योग ) x ऊँचाई

= 1/2 (b1, + b2) h 

= 1/2 × (3 + 4) × 3 = 1/2 × 7× 3 

= 21/2 = 10.5 वर्ग सेमी

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