Whakaoti i te =sqrt{90(90-80)(90-70)(90-30)}

$$= \sqrt { 90 ( 90 - 80 ) ( 90 - 70 ) ( 90 - 30 ) }$$

Aromātai

$$600\sqrt{3}\approx 1039.230484541$$

Ngā Upane Otinga

Tangohia te 80 i te 90, ka 10.

$$\sqrt{90\times 10\left(90-70\right)\left(90-30\right)}$$

Whakareatia te 90 ki te 10, ka 900.

$$\sqrt{900\left(90-70\right)\left(90-30\right)}$$

Tangohia te 70 i te 90, ka 20.

$$\sqrt{900\times 20\left(90-30\right)}$$

Whakareatia te 900 ki te 20, ka 18000.

$$\sqrt{18000\left(90-30\right)}$$

Tangohia te 30 i te 90, ka 60.

$$\sqrt{18000\times 60}$$

Whakareatia te 18000 ki te 60, ka 1080000.

$$\sqrt{1080000}$$

Tauwehea te 1080000=600^{2}\times 3. Tuhia anō te pūtake rua o te hua \sqrt{600^{2}\times 3} hei hua o ngā pūtake rua \sqrt{600^{2}}\sqrt{3}. Tuhia te pūtakerua o te 600^{2}.

$$600\sqrt{3}$$