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30.10.2020 •
Mathematics
325 point What is the Surface Area of the Triangular pyramid? round answer to the tenths place. (Do not type unit labels, only a number) 15.4 yd 13.9 yd 11.5 yd 13.3 yd Your answer ELI
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Ответ:
Step-by-step explanation:
do this in two parts. one, the rectangle, two, the circle
the rectangle , you only have 3 sides to the rectangle.
2 * 25 = 50
1* 30 = 30
total perimeter of the rectangle = 80 cm
the circle, find the total of the circle, then since there is only half and circle, multiply that by 1/2 or divide by 2, same thing.
perimeter of a circle is the circumference
circumference of a circle is 2
r or diameter
, same thing
30
= 94.24777961 cm ( the whole circle )
1/2*94.24777961 =47.1238898 cm
add the two parts
80 + 47.1238898 = 127.1238898 cm
127.12 cm ( rounded to two decimal places )