Question

(ii) The longest chord of a circle is
(iii) cos (90º – 53°) Q ATA ........
होता है।
(iii) The value of cos (90º – 53') is .....​

Answer 1

Answer: The longest chord of a circle is diameter.

Explanation:

• When we connect two points on a circle by a straight line, we get a chord.
• There can be an infinite number of chords of a circle.
• The longest chord passes through the centre of the circle, which is the diameter itself.

Answer: The value of cos(90° - 53°) is sin47°.

Explanation:

• For a right-angled triangle, we must know that sine and cosine ratios of an acute angle are complement to each other.
• i.e., sin(90° - A) = cosA and cos(90° - A) = sinA.