a) the measures of the three angles of a triangle are 42 degrees and 90 degrees. What is the measure of the third degree?
B) find the area of a circular mirror whose diameter is 14 inches. (use 22/7)
2007-01-22 08:01:54 · 4 answers · asked by emily2012 2 in Education & Reference ➔ Homework Help
A: 48
B: 154
2007-01-22 08:06:34 · answer #1 · answered by MarauderX 4 · 0⤊ 0⤋
A) 48°. The internal angles of a triangle always add up to 180°, and 48° is the remainder here.
B) 154 square inches. Area of a circle is equal to pi*r^2, or in this case (22/7)r^2
2007-01-22 16:07:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
(A) first, you have to know that the sum of the 3 interior angles of a triangle equal 180
42 + 90 + x = 180
132 + x = 180
x = 48
(B) pi(r)2 (sorry, it's impossible to write it normally)
22/7(7)2
22/7(49)
154 inches squared
2007-01-22 16:15:07 · answer #3 · answered by kaymay09 4 · 1⤊ 0⤋
A)
side a + side b+ side c = 180
so,
42+90+x=180
132+x=180
x = 48
B)
3.14((14/2)squared)
3.14 * (7 squared)
3.14 * 49
= 153.86 inches
2007-01-22 16:16:29 · answer #4 · answered by Anonymous · 1⤊ 0⤋