Rather than dividing a circle into some number of segments (like 360 degrees), mathematicians often prefer to measure angles using the circumference of a unit circle - a circle with radius 1. This way of measuring angles is called...

In this task, students are shown three unit squares and two line segments connecting two pairs of vertices. They are asked to find the area of a triangle formed by intersecting lines. They can solve it using coordinate geometry or...

In this multi-day activity, 3rd graders make 3 different models of an orphanage floor plan using Google Drawing, Virtual Graph paper, and a construction of rectilinear shapes, to calculate the area of each room using units square.