The perimeter is the total distance around the edge of a 2D shape. Since it is a length, the metric units for perimeter are millimetres (mm), centimetres (cm), metres (m) and kilometres (km).

ZACH: Our virtual house design is looking pretty cool. There’s something missing though. KAYLA: Some windows might be nice. ZACH: Oh yeah, I designed some earlier. ADA: To build the windows, you need ...

Mathematics for CBSE Class 9 introduces many foundational concepts that serve as building blocks for higher classes. Topics such as algebraic identities, the surface areas and volumes of 3D shapes, ...