A toy pyramid has the dimensions shown below. The base of the pyramid i is an equilateral triangle. What is the ared
the base of this pyramid?
9 cm
21 cm
help
![A toy pyramid has the dimensions shown below The base of the pyramid i is an equilateral triangle What is the aredthe base of this pyramid9 cm21 cmhelp class=](https://us-static.z-dn.net/files/da1/e96abb99e3a541626ba4a99efc54c572.jpg)