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91Ó°ÊÓ

RA¯is an altitude of ΔSAT. P and Q are midpoints of SA¯and TA¯. SR=9,RT=16,QT=10,and PR=7.5

Find the perimeter of ΔSAT.

Short Answer

Expert verified

The perimeter of ΔSAT=60.

Step by step solution

01

Step 1. Consider the diagram.

Here, RA¯is an altitude of ΔSAT. Pand Q are midpoints of SA¯and TA¯. SR=9,RT=16,QT=10,and PR=7.5.

02

Step 2. Show the calculation.

By definition of altitude,

RA¯⊥ST¯

The midpoint of the hypotenuse of the right triangle is equidistant from the three vertices.

In ΔART, Q is the midpoint of TA¯.

So,

AQ=RQ=QT

Hence,

AQ=RQ=10

From the segment addition postulate,

AQ+QT=ATAT=10+10=20

In ΔARS, Pis the midpoint of SA¯.

SP=PA=PRSP=PA=7.5

From the segment addition postulate,

SP+PA=SASA=7.5+7.5=15

From the segment addition postulate,

ST=SR+RT=9+16=25

In ΔAST,

Perimeter is:

Perimeter=AS+ST+AT=15+25+20=60

03

Step 3. State the conclusion.

Therefore, the perimeter is 60.

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