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3. A rectangle of length 24cm and breadth 8cm is joint to asemicircle at 1 end along the length find the area and perimeterof the combined regions so form. With diagram (Take = 3.14) |
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Answer» In △ABC AB=AC ⇒∠B=∠C (Angles opposite to equal SIDES are equal) Now using angle SUM property ∠A+∠B+∠C=180 ∘
⇒80 ∘ +∠C+∠C=180 ∘
⇒2∠C=180 ∘ −80 ∘
⇒∠C= 2 100 ∘
=50 ∘
now ∠C+∠x=180 ∘ (Angles MADE on straight line (AC) are supplementary) ⇒50 ∘ +∠x=180 ∘
⇒∠x=180 ∘ −50 ∘ =130 ∘ |
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