Heron's Formula

The area of a right-angled triangle is ________

• $\frac{1}{2\ }\ b\ \times\ h$

• $\sqrt{\frac{3}{16}}\ a^{2\ }$

• $\frac{1}{4}\times b\times\sqrt{4a^{2\ }-\ b^2},\$

• $b\times\ h$

The area of an equilateral triangle is ________

• $\frac{\sqrt{3}}{4}\ a$

• $\frac{1}{4}$ $\sqrt{3\ a}$

• $\sqrt{\frac{3}{4}a}$

• $\frac{\sqrt{3}}{4}\ a^2$

We can find the area of a scalene triangle if _______

• two sides are given

• three sides are given

• not possible

• do not have an idea

Using Heron's Formula, find the Area.

• 56

• 28

• 24.2

• 104.4

The area of any triangle given its sides p cm, q cm, r cm is ____, where 's' represents the semi-perimeter.

•  $\sqrt{s\left(s-a\right)\left(s-b\right)\left(s-c\right)}\ cm$  

•  $\sqrt{s\left(s-p\right)\left(s-q\right)\left(s-r\right)}\ m$  

•  $\sqrt{s\left(s-p\right)\left(s-q\right)\left(s-r\right)}\ cm^2$  

•  $\sqrt{\left(s-p\right)\left(s-q\right)\left(s-r\right)}\ cm^2$  

If the sides of a triangle are 3, 4, and 5, what is the semi-perimeter?

• 3

• 6

• 9

• 12

If the sides of a triangle are 12, 5, and 2. What is the area?

• 12

• 40.65

• 19

• This triangle does not exist

 $16\sqrt{3}\ cm^2$  is the area of an equilateral triangle , then the perimeter of the triangle is 

•  $48\ cm$  

•  $24\ cm$  

•  $12\ cm$  

•  $36\ cm$  

If the perimeter of an equilateral triangle is 60 m, then the area is _______

• $100\sqrt{3}\ m^2$

• $10\sqrt{3}\ m^2$

• $15\sqrt{3}\ m^2$

• $20\sqrt{3}\ m^2$

The area of an isosceles triangle having a base of 2 cm and a length of one of equal sides 4 cm is _______sq. cm

• $\sqrt{15}$

• $\frac{\sqrt{15}}{2}$

• $2\sqrt{15}$

• $4\sqrt{15}$