數學工具：探究四邊形

適用年級：小三或以上

小朋友可在方格紙上製作三角形，程式能從邊和角的特性，辨別這個三角形的種類，並利用公式計算它的周界和面積。

培生香港製作不同的數學工具，供教師於課堂教學或學生課餘自學之用。 Grade Application: small three or more

Kids can make a triangle on graph paper, the program from the characteristic edges and corners, to identify the type of the triangle, and use the formula to calculate its perimeter and area.

Pearson Hong Kong make different mathematical tool for teachers in the classroom or self-study with students after school.