Thanks for sharing.haha, let me 班门弄斧。remember the way to get area is 1/2(base)x(height)
compare these two triangles,
1. DF is base of DEF, AD is base of ABD. Therefore, base(ABD) is 4 times of base(DEF).
2. From the base , i hope you still remember how to draw the height, bcoz BE is 3 times of ED, the height(ABD) is actually 4 times of height(DEF), (bcoz BD is 4 times of ED).
3. so area(ABD) is 4x4 times of area (DEF) , which is 16 times.
4. area (ABD) is 16x2=32
I love maths. but bcoz my english is not good, they dont't allow me to teach EMS (english maths and science).
Erm I don't think that works as there's no indication of a right angle anywhere. and I measured, it's 82-3 degrees and not 90