[b]Passo 1:[/b]Com uma régua, trace um segmento (linha [br]reta) horizontal de 10 centímetros (cm) com extremidades no ponto A e o ponto B e nomeie esse segmento horizontal de AB.[br][b]Passo 2:[/b] Com a régua, sobre o segmento AB, construa um ponto C com 5 cm de distância da extremidade A e da extremidade B (exatamente ao meio).[br][b]Passo 3:[/b] Com o compasso, fixar a ponta seca em cima do ponto C e a outra ponta em cima da extremidade B, formando uma abertura no compasso de 5 cm. Agora gire o compasso mantendo a abertura, formando uma circunferência sobre as extremidades A e B.[br][b]Passo 4[/b]: Construa um Ponto D sobre a circunferência.[br][b]Passo 5:[/b] A partir do ponto A, com a régua, trace um segmento até o ponto D. Nomeie esse segmento como AD.[br][b]Passo 6: [/b]A partir do ponto B, com a régua, trace um segmento até o ponto D. Nomeie esse segmento como BD.
Com o transferidor, verifique o ângulo de abertura entre o segmento AB e BD. Nomeie de ângulo [img width=37,height=23]data:image/png;base64,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[/img]Qual medida angular você encontrou no ângulo [img width=30,height=23]data:image/png;base64,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[/img]?[br][br]
Com o transferidor, verifique o ângulo de abertura entre o segmento BD e AD. Nomeie de ângulo [img width=30,height=23]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAXCAMAAAAr4Q9YAAAAAXNSR0IArs4c6QAAAHhQTFRFAAAAAAAAAAA6ADo6ADpmADqQAGa2OgAAOgA6OjoAOjpmOjqQOmaQOma2OpC2OpDbZgAAZjo6ZpDbZrbbZrb/kDoAkJC2kLbbkNv/tmYAtmY6tpA6tpBmttv/25A627Zm27aQ29u229v/2////7Zm/9uQ//+2///b12QArQAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAtUlEQVQoU9WQyRaCMAxFGwVRnFCpWEUcoOT//9AMrWx0wTluzKbv5PXdpDXmZ4X1ApKq/czDc358mke923y5MH6NvgCuVWtUTQ+B0UxOrPycjns2U4UXIEWFFrZvG22wjWmg5Ha3dimvKOkbk0TRDIm7shO6z2hico0Xicq2X7Z9wXRNM1HTajdkCV2bLCOcHH3FMHGw5UEdE4Qe4EFhnZFCy2PRphGzj8C8UkW7OIDx3/wniRcmCg8I69AVFQAAAABJRU5ErkJggg==[/img]. Qual medida angular você encontrou no ângulo [img width=30,height=23]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAXCAMAAAAr4Q9YAAAAAXNSR0IArs4c6QAAAHhQTFRFAAAAAAAAAAA6ADo6ADpmADqQAGa2OgAAOgA6OjoAOjpmOjqQOmaQOma2OpC2OpDbZgAAZjo6ZpDbZrbbZrb/kDoAkJC2kLbbkNv/tmYAtmY6tpA6tpBmttv/25A627Zm27aQ29u229v/2////7Zm/9uQ//+2///b12QArQAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAtUlEQVQoU9WQyRaCMAxFGwVRnFCpWEUcoOT//9AMrWx0wTluzKbv5PXdpDXmZ4X1ApKq/czDc358mke923y5MH6NvgCuVWtUTQ+B0UxOrPycjns2U4UXIEWFFrZvG22wjWmg5Ha3dimvKOkbk0TRDIm7shO6z2hico0Xicq2X7Z9wXRNM1HTajdkCV2bLCOcHH3FMHGw5UEdE4Qe4EFhnZFCy2PRphGzj8C8UkW7OIDx3/wniRcmCg8I69AVFQAAAABJRU5ErkJggg==[/img]?
Com o transferidor, verifique o ângulo de abertura entre o segmento AD e AB. Nomeie de ângulo [img width=30,height=23]data:image/png;base64,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[/img]. Qual medida angular você encontrou no ângulo [img width=30,height=23]data:image/png;base64,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[/img]?[br][br]
Quantos lados tem a figura construída dentro da circunferência?[br][br]
Quantos ângulos tem a figura construída dentro da circunferência?[br][br]
Qual o nome da figura construída dentro da circunferência?[br][br]
Na figura construída dentro da circunferência, teve algum ângulo com medida igual a 90°? Se sim, qual foi o ângulo?
[list][*]Quando a medida de um ângulo é igual a [b]90°, [/b]chamamos esse ângulo de [b]Ângulo Reto.[/b][/*][/list][br][list][*]Em uma figura que possui três lados e três ângulos, em que um desses ângulo é [b]reto (90º)[/b], chamamos essa figura de [b]Triângulo Retângulo.[/b][/*][/list][br]