The sides of certain triangles are given below. Determine which of them are right triangles.

(iv) $a\ =\ 8\ cm,\ b\ =\ 10\ cm$ and $c\ =\ 6\ cm$

(iii) $a\ =\ 1.6\ cm,\ b\ =\ 3.8\ cm$ and $c\ =\ 4\ cm$

(ii) $a\ =\ 9\ cm,\ b\ =\ 16\ cm$ and $c\ =\ 18\ cm$

What must be added to the numbers 6,10,14 and 22 so that they are in proportion?

Two circles of radii 5 cm and 3 cm intersect at two points and the distance between their centers is 4 cm. Find the length of the common chord.

Write the following integers in descending order:$-99,-990,777,-567,345,-354$.

The volume of a right circular cone is $9856 cm^3$. If the diameter of the base is 28 cm. Find slant height of the cone?

Mr. Sharma is paid an hourly rate. One week he earned Rs.15750 by working 30 hours. If he works 35 hours next week, how much will he earn?

The temperature at the foot of a mountain is $+$ 8°C. It fell down by 10°C at the top of the mountain. The temperature recorded at the top is?

(i) $a\ =\ 7\ cm,\ b\ =\ 24\ cm$ and $c\ =\ 25\ cm$

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