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3 years ago

20 POINTS HURRY PLEASE

Mathematics

2 answers:

grin007 [14]3 years ago

7 0

right triangle

Step-by-step explanation:

i already did this one so this is the correct answer your welcome well this is her sister i took her phone but you may get it correct

irina1246 [14]3 years ago

4 0

Answer:

Not a right-angle triangle

Step-by-step explanation:

15² = 12² + 8²

225 = 144 + 64

225 = 208 is a false statement

So not a right angle triangle

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Amanda [17]

Answer:

The measure of the third arc is $150\°$

Step-by-step explanation:

step 1

we know that

The measurement of the external angle is the semi-difference of the arcs which comprises

in this problem

Let

x----> the greater arc of the circle intercepted by the secant and the tangent

y----> the smaller arc of the circle intercepted by the secant and the tangent

$42\°=\frac{1}{2}(x-y)$

$84\°=(x-y)$ ----> equation A

$\frac{x}{y}=\frac{7}{3}$

$x=\frac{7}{3}y$ -----> equation B

Substitute equation B in equation A and solve for y

$84\°=(\frac{7}{3}y-y)$

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Find the value of x

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step 2

Find the measure of the third arc

Let

z------> the measure of the third arc

we know that

$x+y+z=360\°$ -----> complete circle

substitute the values and solve for z

$147\°+63\°+z=360\°$

$z=360\°-(147\°+63\°)=150\°$

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