Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
 Kuna pembetatu ambayo ina upana wa inchi 4. Ikiwa umbo la pembetatu ni inchi 30, ni eneo la pembetatu ni lipi?


### Response:
 Mara mbili ya urefu wa pembetatu ni inchi 30 - inchi 4 * 2 = <<30-4*2=22>>22 inchi.
Urefu wa pembetatu ni inchi 22 / 2 = <<22/2=11>>11 inchi.
Eneo la pembetatu ni inchi 4 * inchi 11 = <<4*11=44>>44 inchi mraba.