If (a, b) lies on circle with centre as origin, then its radius w… - Vidyadip

MCQ

If (a, b) lies on circle with centre as origin, then its radius will be:

A
$\text{a} - \text{ b}$
B
$\text{a + b}$
C
$\sqrt{\text{a}^2+\text{b}^2}$
D
$\text{a}^2+\text{b}^2$

✓

Answer

$\sqrt{\text{a}^2+\text{b}^2}$

Solution:

We know the formula,

The equation of a circle of radius r and centre the origin is

x²+ y²= r²

Here the center is (a, b)

so Radius, $\text{r} = \sqrt{\text{a}^{2} + \text{b}^{2}}$

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