24th Philippine Mathematical Olympiad - Qualifying Stage - Part 1 - Question 13

[@RAG981]

You did not need b and h. Find areas of the 3 triangles in the corners = 4+14+16=34. Take from 64 gives the area of the "double" triangle is 30. The shaded one wanted is half this plus 4 = 19.

[@eltayebeltayeb1568]

Sir your voice is low..

[@themathkage]

I'll improve my succeeding videos. Thank you for your feedback.