3 years ago

A triangle with a base of 5 inches a height of 4 inches.

Mathematics

2 answers:

Degger [83]3 years ago

7 0

Answer:

If your asking if your work is correct, its not.

Each triangle has an area of 10 inches

the total area of the placemat is 420 inches

Step-by-step explanation:

Formula for area of a triangle is $\frac{1}{2}$ b · h

andrezito [222]3 years ago

7 0

Answer: First one is 10, then the second one (below) is 420

Step-by-step explanation:

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3 years ago

Find the cube roots of 8(cos 216° + i sin 216°).

Tomtit [17]

$z^3=8(\cos216^\circ+i\sin216^\circ)$
$z^3=2^3(\cos(6^3)^\circ+i\sin(6^3)^\circ)$
$\implies z=8^{1/3}\left(\cos\left(\dfrac{216+360k}3\right)^\circ+i\sin\left(\dfrac{216+360k}3\right)^\circ\right)$

where $k=0,1,2$ . So the third roots are

$z=\begin{cases}2(\cos72^\circ+i\sin72^\circ)\\2(\cos192^\circ+i\sin192^\circ)\\2(\cos312^\circ+i\sin312^\circ)\end{cases}$