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28 votes
28 votes
QR is 45 mm. RS is one third of QR. QT is 90 mm. Find ST. HELPPPPP PLS!!!

QR is 45 mm. RS is one third of QR. QT is 90 mm. Find ST. HELPPPPP PLS!!!-example-1
User Yuvaraj P
by
2.5k points

2 Answers

16 votes
16 votes
The answer is 30.
This is because QT is equal to all the measurements added up.
QR=45
RS=45/3
QT=90
ST=?

QR=45
RS=15
QT=90
ST=?

QR+RS=?
45+15= 60

QT-60=?
90-60=30

Therefore ST (the answer) is 30.
User Neeraj Garg
by
3.2k points
12 votes
12 votes

Answer:

30

Explanation:

Given:

QR= 45 mm

RS= 15, (1/3 of QR is 15).

QT is 90 mm

We must find ST.

Equation:

Use Segment Addition Postulate Theroem,

QR+RS+ST=QT

Subsitue the values we know

45+15+ST=90

60+ST=90

ST=30So ST length is 30 m

User Ravi Mittal
by
3.3k points