In this lesson, we will look at the formula used to calculate the area of a triangle. You will learn it with the help of some
examples and practice questions with solution, using video explanations by the instructor.
You will look at some of the formulas used to calculate the areas of triangles.
If the base of a triangle is b and the height is h, then the area of the triangle is: 1/2 x base x height.
(More text below video...)
(Continued from above)
E.g. if base of a triangle is 20 cm and height
10cm, then calculated area using above formula is 1/2 x 20 x 10 = 100 cm^{2}.
If base of the triangle and its area is known, then height is given by: height =
2 x Area/Base. E.g. if the area of a triangle is 300 cm^{2} and height is
10 cm, then base is 60 cm.
If three sides of a triangle a, b, c are given, we can use Heron's formula:
Area = ((s)(s
 a)(s  b)(s  c)) where s= (a + b + c)/2
Given the lengths of two sides of a triangle a, b and the measure of angle C between them, the following formula can be used:
Area of triangle = 1/2 ab sin C .
Winpossible's online math courses and tutorials have gained rapidly popularity since
their launch in 2008. Over 100,000 students have benefited from Winpossible's courses...
these courses in conjunction with free unlimited homework help serve as a very effective
mathtutor for our students.

All of the Winpossible math tutorials have been designed by topnotch instructors
and offer a comprehensive and rigorous math review of that topic.

We guarantee that any student who studies with Winpossible, will get a firm grasp
of the associated problemsolving techniques. Each course has our instructors providing
stepbystep solutions to a wide variety of problems, completely demystifying the
problemsolving process!

Winpossible courses have been used by students for help with homework and by homeschoolers.

Several teachers use Winpossible courses at schools as a supplement for inclass
instruction. They also use our course structure to develop course worksheets.