1.

In the given fig AB diameter of a circle AC 6 cm and BC 8 cm find the area of the shaded portion

Answer»

Answer:

GIVEN:

AB is the diameter =d of a CIRCLE.

ΔABC has the diameter AB as base & the point C is on the circumference.

AC=6 cm and BC=8 cm.

To find out:

AREA of shaded portion in the given circle.

Solution:

∠ACB=90

o

since ΔABC has been inscribed in a semicircle.

∴ΔABC is a right one with AB as hypotenuse ...(i)

So, applying Pythagoras theorem, we have

AB=

(AC)

2

+(BC)

2

=

(6)

2

+(8)

2

cm=10 cm=d.

∴ The RADIUS of the given circle =

2

d

=

2

10

cm=5 cm.

i.e The Area of circle =πr

2

=3.14×5

2

cm

2

=78.5cm

2

.

Again, Area of ΔABC=

2

1

×AC×BC (by i)

=

2

1

×6×8cm

2

=24cm

2

.

Now, Area of shaded region = Area of circle − area of ΔABC

=(78.5−24)cm

2

=54.5cm

2

.


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