A question about angle bisectors Consider a △ABC in which D, E and F are the midpoints of the sides BC, CA and AB respectively. Let G be the centroid of triangle ABC, i.e., the point of intersection of the medians AD, BE and CF. It is well-known that G is also the centroid of triangle DEF. If, instead of being the midpoints, the points D, E and F are the points of intersection of the internal bisectors of

Some problems for the Senior School.

In this article, we return to Viviani's theorem and discuss a proof-without-words.

This worksheet is designed to help students understand the difference between a hill and a mountain. The worksheet will also help them integrate learnings of science, maths and other subjects into social science and geography.

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