" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
13. t = √(13² - ((20-10)1/2)²) = √(269 - 25) = √144 = 12 cm
L = 1/2 x 12(20 + 10) = 6(30) = 180 cm²