Question

Q.4. Answer in one word:
(i) Write Euler's Formula.
(ii) Write formula for calculating perimeter of square & rectangle
(iii) How many surfaces are there in cube?
(iv) Evaluate(1/3)–5.
(v) Find the value of x, X + 20 = 25.
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Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

i)

$F+V-E=2 \\\\ where, \\ F - Number \: \: of \: \: faces \\ V - Number \: \: of \: \: vertices \: \: (Corners) \\ E - Number \: \: of \: \: edges$

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ii) Square P=4s where s is the length of the side of the square.

Rectangle P=2L+2W where L and W are the lengths of the rectangle's sides (length and width).

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iii) $6$

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iv)

$\frac{1}{3} - 5 \\ \\ \frac{1}{3} - \frac{15}{3} \\ \\ \frac{1 - 15}{3} \\ \\ = \: \: \frac{ - 14}{3}$

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v) $x + 20 = 25 \\ x = 25 - 20 \\ x = 5$