Lucky13
Lucky13
06-02-2015
Mathematics
Answered
Help please! I have choral practice...
Answer :
Аноним
Аноним
06-02-2015
This polygon is composed of a right triangle and
a parallelogram.
The area of right angle :
[tex]A_\Delta=\frac{1}{2}\cdot15\cdot8=\frac{1}{2}\cdot120=\boxed{60\ (cm^2)}[/tex]
The area of the
parallelogram
:
[tex]A_P=15\cdot(13-8)=15\cdot5=\boxed{75\ (cm^2)}[/tex]
The area of the polygon is equal:[tex]A=A_\Delta+A_P[/tex]
Therefore, the answer is:
[tex]\boxed{\boxed{A=60\ cm^2+75\ cm^2=135\ cm^2}}[/tex]
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AL2006
AL2006
06-02-2015
Slice the picture in half, across the middle dotted line.
The top half is a triangle. Its base is 15cm and its height is 8cm .
Area of a triangle is (1/2) (base x height) = (1/2) (120cm²) = 60 cm².
The bottom half is a parallelogram. Its base is 15cm and its height is 5cm.
Area of a parallelogram is (base x height) = (15cm x 5cm) = 75 cm².
Add the two pieces together. (60cm²) + (75 cm²) =
135 cm²
Breathe from the diaphragm, enunciate, and watch the conductor.
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