1. 13.7 Processing data lah and draw result of measurement.
Wide [of] facet three :
Using trilateral formulas
Wide [of] trilateral any
Wide [of] triangle of A = s(s – a)(s – b) ( s – c)
Where :
S ½ ( A a+b+c)
A, b , c is side – ABC triangle side any.
If/When trilateral angle;corner can be measured formula as following :
Wide [of] ABC = ½ ab Ý or sin ½ bc * sin
= ½ ac * sin ßDimana ά, ß dan Ý adalah besar angle;corner flanked by trilateral two sides measured.

2. Luas trapesium Trapesium biasa ABCD Luas trapesium ABCD = AB + CD X AD2
Trapesium siku-siku ABCD
Luas trapesium ABCD = AB + CD X DE