Question

explain (5×10+8×4) is a composite number ,why?​

Answer 1

Answer:

Radius of circle is 49.9 cm (approx).

Area of circle is 7825.74 cm² (approx).

Explanation:

Given :-

Circumference of circle is 314 cm.

To find :-

Radius of circle.

Area of circle.

Solution :-

Circumference of circle = 2πr

Where,

r is radius of circle.

π is 22/7 or 3.14 .

Put the values :

\rightarrow → 314 = 2πr

\rightarrow → 314 = 2 × 22/7 × r

\rightarrow → 314 = 44/7 × r

\rightarrow → 314 × 7 = 44 × r

\rightarrow → 2198 = 44 × r

\rightarrow → 2198/44 = r

\rightarrow → r = 49.9

Thus,

Radius of circle is 49.9 cm (approx).

Now,

We know,

Area of circle = πr²

Put r in formula :

\rightarrow → 22/7 × (49.9)²

\rightarrow → 22/7 × 2490.01

\rightarrow → 54780.22/7

\rightarrow → 7825.74

Therefore,

Area of circle is 7825.74 cm² (approx).

Answer 2

5 * 10 + 8 * 4
= 50 + 32
= 2(25 + 16)
= 2 * 41
More than 1 factor
Therefore this is composite number.....