Answer:
x= - 3 and y= - 7
Step-by-step explanation:
<span>Given ratio between the base angle and vertical angle of an isosceles traingle is 2:5
⇒ base angle / vertical angle = 2 / 5
let base angle = x
⇒ verticle angle = (5/2)x
we know that
verticle angle + base angle + base angle = 180°
⇒ ( 5/2 + 1 + 1 ) x = 180°
⇒ (9/2)x = 180°
⇒ x = ( 180° x 2) / 9
⇒ x = 40°
verticle angle = (5/2) x 40° = 100°
</span>
11>12c because 26-15>12c which equals 11>12c
Answer:
A = 28.26 cm², P = 38 units, A = 20 units², C = 43.96 units
Step-by-step explanation:
1) Our area of a circle is πr². Since our r = 3 cm, we can just substitute for r.
A = πr²
A = (3.14)(3)²
A = (3.14)(9)
A = 28.26 cm², like in your work.
2) Our formula for perimeter is 2l + 2w. We substitute for l = 12 and w = 7.
P = 2l + 2w
P = 2(12) + 2(7)
P = 24 + 14
P = 38 units
3) The formula for a triangle's area is A =
bh, so we substitute for b = 10 and h = 4.
A =
bh
A =
(10)(4)
A =
(40)
A = 20 units²
4) Circumference is 2πr, and we substitute for r = 7.
C = 2πr
C = 2(3.14)(7)
C = (3.14)(14)
C = 43.96 units