23. 15.63-8.79 The perimeter of a quadrilateral is 412.95 cm. If the three known sides measures 85.56cm, 112.77 cm, and 85.26 cm, how long is the fourth side?

ANS. The fourth side is 129.36 cm long.

SOLUTION.

- 412.95 cm - (85.56 cm + 112.77 cm + 85.26 cm)

= 412.95 cm - 283.59 cm

= 129.36 cm

24. I bought 4 items worth P39.90, P68.60, P 58.75 and P120.25. How much change will I get from P 500-bill? I

ANS. He will get P 212.5 change from her P500-bill.

SOLUTION.

- P 500 - ( P39.90 + 68.60 + 58.75 + 120.25 )

= 500 - 287.5

= P 212.5

25. A rectangle is 13.8cm. long and and 9.7 cm wide. Find its perimeter.​

ANS. The perimeter of the rectangle is 47 cm.

SOLUTION.

- P = 2 (13.8 cm) + 2 (9.7 cm)

= 27.6 cm + 19.4 cm

= 47 cm