perimeter and area

What does perimeter mean?

• the amount of space inside a shape
• the distance around the shape
• the amount of space inside a shape divided by two
• half the distance around a shape

The space inside an object is called it's

• area

• perimeter

find the area of the given triangle.

A triangle has Base= 20 cm, Area of the Parallelogram = 246 cm^{2 .} Find it's Height.

• 492 cm

• 13.2 cm

• 12.3 cm

• 11cm

PQRS is a parallelogram. QM is the height from Q to SR, and QN is the height from Q to PS. If SR = 12 cm and QM = 7.6 cm, find QN, if PS = 8 cm.

ΔABC is right-angled at A. AD is perpendicular to BC. If AB = 5 cm, BC = 13 cm and AC = 12 cm, find the area of ΔABC.

ΔABC is isosceles with AB = AC = 7.5 cm and BC = 9 cm. The height AD from A to BC is 6 cm. After finding the area of ΔABC, find CE.

• 2.7 cm

• 7.3cm

• 7.2 cm

• 6cm

Answer explanation

Area of the ΔABC = ½ × Base × Height

= ½ × AB × AC

= ½ × 5 × 12

= 1 × 5 × 6

= 30 cm²

Now,

Area of ΔABC = ½ × Base × Height

30 = ½ × AD × BC

30 = ½ × AD × 13

(30 × 2)/13 = AD

AD = 60/13

AD = 4.6 cm

The perimeter of a circle is also known as the ______of the circle

• area

• arc

• circumference

• 110 cm

• 55 cm

• 100 cm

Find the area of a circle whose radius is 21 cm.