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sorry bro I don't know this answer
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1. B= 60°
A = 120°
C = 60°
2. No
3. Area of rectangle = length × breadth
= 18cm × 12cm
= 216 cm²
Area of triangle = 1/2 × b × h
= 1/2 × 15cm × 10cm
= 1/2 × 150
= 75 cm²
Area of shaded portion = area of rectangle - area of triangle
= 216cm² - 75 cm²
= 141 cm²
4. 1 cm
5. 20
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