Rectangle diagonal

The rectangle, one side of which is 5 cm long, is divided by a 13 cm diagonal into two triangles. Calculate the area of one of these triangles in cm2.

Correct result:

S =  30 cm2

Solution:

a=5 cm u=13 cm  b=u2−a2=132−52=12 cm  S=a⋅ b2=5⋅ 122=30 cm2

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