EASY
7th CBSE
IMPORTANT
Earn 100

If area of a triangular piece of cardboard is 90 cm2, then the length of altitude corresponding to 20 cm long base is  cm.

50% studentsanswered this correctly

Chapter-Wise 3D Mathematics Videos from NCERT NCERT Exemplar Mathematics - Class 7

Finding Area of Equilateral Triangle
02 min 54 sec

Finding Area of Equilateral Triangle

We know that if all sides of a triangle are equal, then it is an equilateral triangle. Is there a formula to find the area of an equilateral triangle? Let's...
Finding Area of Any Triangle
06 min 01 sec

Finding Area of Any Triangle

We can find the area of any triangle if we get to know one of its sides and its corresponding altitude. Let's watch this video and explore the concept.
Understanding Area of Right Triangles
03 min 56 sec

Understanding Area of Right Triangles

When you cut a slice of bread diagonally in half, you get a right-angled triangle. Do you know how to find the area of the right triangle? Watch the video to...