Explanation

The formula relating arc length (l), radius (r), and central angle (θ) is:

l = rθ

Given:

l = 45 cm

r = 9 cm

θ = l / r

= 45 / 9

= 5 radians

Explanation

To find the length of the chord, we can use the formula:

Length = 2 * √(r² - d²)

where r is the radius and d is the distance from the center.

Given:

r = 5 cm

d = 3 cm

Length = 2 * √(5² - 3²)

= 2 * √(25 - 9)

= 2 * √16

= 2 * 4

= 8 cm

Explanation

In Maths, a straight angle is an angle equal to 180°.

It is called straight because it appears as a straight line.

Explanation

The surface area of a cuboid is given by:

2(lb + bh + hl)

Where l = 12cm, b = 8cm, h = 6cm

Surface area = 2(12_8 + 8_6 + 6*12)

= 2(96 + 48 + 72)

= 2(216)

= 432cm²

Explanation

Coterminal angles differ by full rotations of 360°.

To find a coterminal angle of -60°, add or subtract 360°:

-60° + (-360°) = -420° → This is coterminal with -60°.

So, -420° and -60° share the same terminal side.