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3 सेमी ऊँचाई के समलम्ब का क्षेत्रफल 36 वर्ग सेमी है। इसकी समांतर भुजाओं में से एक भुजा की लम्बाई 9 सेमी सेमी है। दूसरी समांतर भुजा की लम्बाई ज्ञात कीजिए।

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b1 = 9 सेमी, b = 3 सेमी तथा समलम्ब का क्षेत्रफल = 36 वर्ग सेमी

अतः समलम्ब का क्षेत्रफल  = \(\frac12\) (समान्तर भुजाओं का योग ) x ऊँचाई 

= \(\frac12\) (b1 + b2) h

⇒ 36 = 2x (9+b2) × 3

⇒ 72 = 27 - 3b2

⇒ 45 = 3b2 

⇒ b2 = 45/3 =15 सेमी
अतः दूसरी समान्तर भुजा की लम्बाई 15 सेमी

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