Question
Simplify: $10-\{4 \mathrm{a}-(7-\overline{\mathrm{a}-5}-(5 \mathrm{a}-\overline{1+\mathrm{a}}))$
✓
Answer
$\begin{aligned} & 10-\{4 a-(7-\overline{a-5}-(5 a-\overline{1+a})) \\ & =10-\{4 a-(7-a+5)-(5 a-1-a)\} \\ & =10-\{4 a-(12-a)-(4 a-1)\} \\ & =10-\{4 a-12+a-4 a+1\} \\ & =10-4 a+12-a+4 a-1 \\ & =10+12-1-4 a-a+4 a \\ & =21-a\end{aligned}$
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(a) 11 cm $\quad$$\quad$(b) 13 cm$\quad$$\quad$(c) 22 cm$\quad$$\quad$(d) 33 cm
Q.2. If he formed a square from the string, the area of the square would be :
(a) $212.5 cm^2$$\quad$$\quad$ (b) $272.25 cm^2$ $\quad$$\quad$(c) $312.75 cm^2$$\quad$$\quad$ (d) $324 cm^2$
Q.3. He formed a circle from the string. Find the radius of the circle formed. [Use $\pi \frac{22}{7}$ ]
(a) 7 cm $\quad$$\quad$(b) 7.5 cm $\quad$$\quad$(c) 9 cm$\quad$$\quad$ (d) 10.5 cm
Q.4. The area of the circle formed from the string will be : [Use $\pi \frac{22}{7}$ ]
(a) $272.25 cm^2$$\quad$$\quad$(b) $346.5 cm^2$ $\quad$$\quad$(c) $414.75 cm^2$ $\quad$$\quad$(d) $452 cm^2$
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