Answer:
118.4cm2
Explanation:
Surface area of square :5×5=25
Surface area for one triangle:
square root of 9²+2.5²=9.340770846
Area of triangle 0.5×5×9.340770846=23.35192712
As there is 4 triangle do 23.35192712×4=93.40770846
After
25+93.40770846=118.4077085
1dp= 118.4cm²