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| Ques 1. Factorize : a-b-a3+b3 | ||||
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| Ques 3. Four times the double of an angle is its supplement. find the angle | ||||
| Ans: Let the angle = x° By the condition 4x2x+x=180° 8x+x=180° 9x°=180° x=20° \ The required angle = 20° |
| Ques 4. In the given Fig DE=3/4 BC, DE ll BC and the distance between DE and BC is 3 units; If BE is 6 units, what is the area of DBCE? | ||||
| Ans: Area (DBCE) = 1/2 (DE+BC) x3 = 1/2 [3/4 BC + BC] x 3 (\DE = 3/4 BC) = 1/2 [3/4 x 6 +6] x 3 [\ BC = 6 units] = 1/2 [9/2 + 6] x 3 = 1/2 x 21/2 x 3 = 63/4 = 15 3/4 sq units |
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Ques 6. The following flowchart is drawn to find the area of a triangle with the given sides. Complete the boxes number 4 and 5
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