Since the triangle is equilateral, all its angles are equal to 60°
AO is the bisector⇒∠OAD = 30°
AO AO is the hypotenuse, ∠OAD = 30°⇒
OD=10:2=5ft
By the Pythagorean theorem
![10^2=AD^2+5^2\\AD=\sqrt{100-25} \\AD=\sqrt{75}](https://tex.z-dn.net/?f=10%5E2%3DAD%5E2%2B5%5E2%5C%5CAD%3D%5Csqrt%7B100-25%7D%20%5C%5CAD%3D%5Csqrt%7B75%7D)
![AC=AD+DC=2\sqrt{75}=10\sqrt{3}](https://tex.z-dn.net/?f=AC%3DAD%2BDC%3D2%5Csqrt%7B75%7D%3D10%5Csqrt%7B3%7D)
![S=\frac{a^2\sqrt{3} }{4}](https://tex.z-dn.net/?f=S%3D%5Cfrac%7Ba%5E2%5Csqrt%7B3%7D%20%7D%7B4%7D)
![S=\frac{(10\sqrt{3})^2\sqrt{3} }{4} =\frac{300\sqrt{3} }{4} =75\sqrt{3} ft^2](https://tex.z-dn.net/?f=S%3D%5Cfrac%7B%2810%5Csqrt%7B3%7D%29%5E2%5Csqrt%7B3%7D%20%20%7D%7B4%7D%20%3D%5Cfrac%7B300%5Csqrt%7B3%7D%20%7D%7B4%7D%20%3D75%5Csqrt%7B3%7D%20ft%5E2)
Answer: A)
ft²
P.S. Hello from Russia and sorry for my bad english :^)
Answer:
11
Step-by-step explanation:
The sum of the remote interior angles = the exterior angle
66 + 7x + 7 = 12x + 18
7x + 73 = 12x + 18
55 = 5x
x = 11
B
Step-by-step explanation:
2000$ is far from 30$ so it is b
Dontcha mean how many grams are in a pound
Thanks dude!
Step-by-step explanation:
Can i have brainly?