Mathematics, 28.07.2019 03:30 firenation18

Using the technique in the model above, find the missing segments in this 30°-60°-90° right triangle. bc = 2 cd =

Using the technique in the model above, find the missing segments in this 30°-60°-90° right triangle

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Answer from: goodclock

Consider right triangle BCD: angle D is right and angle B has measure 60°, then angle C has measure 180°-90°-60°=30°. BC is the hypotenuse of this triangle. In special 30°-60°-90° right triangle the leg that lies opposite to the angle 30° is half of hypotenuse. So, BD=BC/2=2/2=1.

Consider right triangle ABC: angle C is right, angle B has measure 60° and angle A has measure 30°. AB is the hypotenuse of this triangle. In special 30°-60°-90° right triangle the leg that lies opposite to the angle 30° is half of hypotenuse. So, BC=AB/2, therefore AB=2BC=2·2=4 .

The hypotenuse AB consists of two parts: AD and BD. Since AB=4, BD=1, you have that AD=AB-BD=4-1=3.

The height of right triangle drawn to the hypotenuse is the geometrical mean of the previous parts:

$CD^2=AD\cdot BD,\\ CD^2=3\cdot 1=3,\\ CD=\sqrt{3}$ .

Consider right triangle ACD: angle D is right and angle A has measure 30°, then angle C has measure 180°-90°-30°=60°. AC is the hypotenuse of this triangle. In special 30°-60°-90° right triangle the leg that lies opposite to the angle 30° is half of hypotenuse. So, CD=AC/2, AC=2·CD=2·√3=2√3.

AB=4 (hypotenuse), BD=1 and AD=3 (legs projections on the hypotenuse), CD=√3 (height to the hypotenuse), AC=2√3 and BC=2 (legs).

Answer from: lchynnawalkerstudent

CD= $\sqrt{3}$

Step-by-step explanation: We are given triangle ABC.

CD is a perpendicular line on AB.

< B = 60°

BC = 2 units.

We need to find the value of side CD.

In triangle BCD, we can see that <CDB is a right triangle, because CD is a perpendicular line on AB.

And <CBD = 60° that is given.

Therefore, < BCD = 30 degrees angle.

In order to find the value of CD, we can apply 30°-60°-90° right triangle rule to find the value of CD.

According to 30°-60°-90° right triangle rule adjacent side of 60° angle is half of Hypotenuse.

Therefore, BD = Half of BC = 2/2 = 1 unit.

And according to 30°-60°-90° right triangle rule opposite side is $\sqrt{3}$ times of adjacent side of 60° angle.

Therefore, CD = BD × $\sqrt{3}$ = 1× $\sqrt{3}$ = $\sqrt{3}$ .

Therefore, CD = $\sqrt{3}$ .

Answer from: Quest

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

Very urgent! for the figures below, assume they are made of semicircles, quarter circles and square

Answer from: Quest

Idon’t have want a lot more

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Using the technique in the model above, find the missing segments in this 30°-60°-90° right triangle...

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