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

### Instruction:
 Umbo la pembetatu lina umbo wa 160 cm. Ikiwa pande mbili ni 40 cm na 50 cm, tafadhali pima urefu wa upande wa tatu?


### Response:
 Ili kupata umbo wa pembetatu, unahitaji kuongeza pande zote, hivyo 40 + 50 + upande mwingine = 160
Ikiwa pande mbili zina jumla ya 160, basi upande mwingine ni 160-40-50 = <<160-40-50=70>>70 cm.