Answer:
The length of PR is 15.8 cm
Step-by-step explanation:
We will solve the question using the cosine rule
In ΔPQR
∵ (PR)² = (PQ)² + (RQ)² - 2(PQ)(RQ)(cos∠Q)
∵ PQ = 17.8 cm
∵ RQ = 26.3 cm
∵ m∠Q = 36°
→ Substitute them in the rule above
∵ (PR)² = (17.8)² + (26.3)² - 2(17.8)(26.3)(cos36)
∴ (PR)² = 316.84 + 691.69 - 936.28(cos36)
∴ (PR)² = 251.0635685
→ Take √ for both sides
∴ PR = 15.8449856
→ Correct it to 3 significant figures
∴ PR = 15.8 cm
∴ The length of PR is 15.8 cm
Answer:
Number 4 i just got done with this problem >33 brainliest ~shay
Step-by-step explanation:
Answer:
3x+8=20
Step-by-step explanation:
take 8 and minus 8 from both sides then divide 12 by 3x
The side lengths of a triangle are 5,8 and 12 is this a right triangle?
A. no, because 5 + 8 ≠ 12.
B. yes, because 5² + 8² = 12².
C. no, because 5²+ 8² ≠ 12².
D. yes, because 5² + 8² < 12²
Step-by-step explanation:
Pythagoras theorem states c^2=a^2 + b^2
5^2=25
8^2=64
25+64=89
Answer:
-5
Step-by-step explanation: