Find the perimeter of an isoceles triangle with equal sides 10cm and third side 7cm.

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Given:
a =
b =
c =

we know that,
= + +
= + +
=

The of the is